<?php
namespace Zxing\Common;
/**
* <p>A simple, fast array of bits, represented compactly by an array of ints internally.</p>
*
* @author Sean Owen
*/
final class BitArray {
private $bits;
private $size;
public function __construct($bits=array(),$size=0) {
if(!$bits&&!$size){
$this->$size = 0;
$this->bits = array();
}elseif($bits&&!$size){
$this->size = $bits;
$this->bits = $this->makeArray($bits);
}else{
$this->bits = $bits;
$this->size = $size;
}
}
public function getSize() {
return $this->size;
}
public function getSizeInBytes() {
return ($this->size + 7) / 8;
}
private function ensureCapacity($size) {
if ($size > count($this->bits) * 32) {
$newBits = $this->makeArray($size);
$newBits = arraycopy($this->bits, 0, $newBits, 0, count($this->bits));
$this->bits = $newBits;
}
}
public function get($i) {
$key = intval($i / 32);
return intval32bits($this->bits[$key] & (1 << ($i & 0x1F))) != 0;
}
public function set($i) {
$this->bits[intval($i / 32)] |= 1 << ($i & 0x1F);
$this->bits[intval($i / 32)] = overflow($this->bits[intval($i / 32)]);
}
public function flip($i) {
$this->bits[intval($i / 32)] ^= 1 << ($i & 0x1F);
$this->bits[intval($i / 32)] = overflow32($this->bits[intval($i / 32)]);
}
public function getNextSet($from) {
if ($from >= $this->size) {
return $this->size;
}
$bitsOffset = intval($from / 32);
$currentBits = (int)$this->bits[$bitsOffset];
$currentBits &= ~((1 << ($from & 0x1F)) - 1);
while ($currentBits == 0) {
if (++$bitsOffset == count($this->bits)) {
return $this->size;
}
$currentBits = $this->bits[$bitsOffset];
}
$result = ($bitsOffset * 32) + numberOfTrailingZeros($currentBits); return $result > $this->size ? $this->size : $result;
}
public function getNextUnset($from) {
if ($from >= $this->size) {
return $this->size;
}
$bitsOffset = intval($from / 32);
$currentBits = ~$this->bits[$bitsOffset];
$currentBits &= ~((1 << ($from & 0x1F)) - 1);
while ($currentBits == 0) {
if (++$bitsOffset == count($this->bits)) {
return $this->size;
}
$currentBits = overflow32(~$this->bits[$bitsOffset]);
}
$result = ($bitsOffset * 32) + numberOfTrailingZeros($currentBits);
return $result > $this->size ? $this->size : $result;
}
public function setBulk($i, $newBits) {
$this->bits[intval($i / 32)] = $newBits;
}
public function setRange($start, $end) {
if ($end < $start) {
throw new \InvalidArgumentException();
}
if ($end == $start) {
return;
}
$end--; $firstInt = intval($start / 32);
$lastInt = intval($end / 32);
for ($i = $firstInt; $i <= $lastInt; $i++) {
$firstBit = $i > $firstInt ? 0 : $start & 0x1F;
$lastBit = $i < $lastInt ? 31 : $end & 0x1F;
$mask = 0;
if ($firstBit == 0 && $lastBit == 31) {
$mask = -1;
} else {
$mask = 0;
for ($j = $firstBit; $j <= $lastBit; $j++) {
$mask |= 1 << $j;
}
}
$this->bits[$i] = overflow32($this->bits[$i]|$mask);
}
}
public function clear() {
$max = count($this->bits);
for ($i = 0; $i < $max; $i++) {
$this->bits[$i] = 0;
}
}
public function isRange($start, $end, $value) {
if ($end < $start) {
throw new \InvalidArgumentException();
}
if ($end == $start) {
return true; }
$end--; $firstInt = intval($start / 32);
$lastInt = intval($end / 32);
for ($i = $firstInt; $i <= $lastInt; $i++) {
$firstBit = $i > $firstInt ? 0 : $start & 0x1F;
$lastBit = $i < $lastInt ? 31 :$end & 0x1F;
$mask = 0;
if ($firstBit == 0 && $lastBit == 31) {
$mask = -1;
} else {
$mask = 0;
for ($j = $firstBit; $j <= $lastBit; $j++) {
$mask = overflow32($mask|(1 << $j));
}
}
if (($this->bits[$i] & $mask) != ($value ? $mask : 0)) {
return false;
}
}
return true;
}
public function appendBit($bit) {
$this->ensureCapacity($this->size + 1);
if ($bit) {
$this->bits[intval($this->size / 32)] |= 1 << ($this->size & 0x1F);
}
$this->size++;
}
public function appendBits($value, $numBits) {
if ($numBits < 0 || $numBits > 32) {
throw new \InvalidArgumentException("Num bits must be between 0 and 32");
}
$this->ensureCapacity($this->size + $numBits);
for ($numBitsLeft = $numBits; $numBitsLeft > 0; $numBitsLeft--) {
$this->appendBit((($value >> ($numBitsLeft - 1)) & 0x01) == 1);
}
}
public function appendBitArray($other) {
$otherSize = $other->size;
$this->ensureCapacity($this->size + $otherSize);
for ($i = 0; $i < $otherSize; $i++) {
$this->appendBit($other->get($i));
}
}
public function _xor($other) {
if (count($this->bits) != count($other->bits)) {
throw new \InvalidArgumentException("Sizes don't match");
}
for ($i = 0; $i < count($this->bits); $i++) {
$this->bits[$i] ^= $other->bits[$i];
}
}
public function toBytes($bitOffset, &$array, $offset, $numBytes) {
for ($i = 0; $i < $numBytes; $i++) {
$theByte = 0;
for ($j = 0; $j < 8; $j++) {
if ($this->get($bitOffset)) {
$theByte |= 1 << (7 - $j);
}
$bitOffset++;
}
$array[(int)($offset + $i)] = $theByte;
}
}
public function getBitArray() {
return $this->bits;
}
public function reverse() {
$newBits = array();
$len = (($this->size-1) / 32);
$oldBitsLen = $len + 1;
for ($i = 0; $i < $oldBitsLen; $i++) {
$x = $this->bits[$i];
$x = (($x >> 1) & 0x55555555) | (($x & 0x55555555) << 1);
$x = (($x >> 2) & 0x33333333) | (($x & 0x33333333) << 2);
$x = (($x >> 4) & 0x0f0f0f0f) | (($x & 0x0f0f0f0f) << 4);
$x = (($x >> 8) & 0x00ff00ff) | (($x & 0x00ff00ff) << 8);
$x = (($x >> 16) & 0x0000ffff) | (($x & 0x0000ffff) << 16);
$newBits[(int)$len - $i] = (int) $x;
}
if ($this->size != $oldBitsLen * 32) {
$leftOffset = $oldBitsLen * 32 - $this->size;
$mask = 1;
for ($i = 0; $i < 31 - $leftOffset; $i++) {
$mask = ($mask << 1) | 1;
}
$currentInt = ($newBits[0] >> $leftOffset) & $mask;
for ($i = 1; $i < $oldBitsLen; $i++) {
$nextInt = $newBits[$i];
$currentInt |= $nextInt << (32 - $leftOffset);
$newBits[intval($i) - 1] = $currentInt;
$currentInt = ($nextInt >> $leftOffset) & $mask;
}
$newBits[intval($oldBitsLen) - 1] = $currentInt;
}
$bits = $newBits;
}
private static function makeArray($size) {
return array();
}
public function equals($o) {
if (!($o instanceof BitArray)) {
return false;
}
$other = $o;
return $this->size == $other->size && $this->bits===$other->bits;
}
public function hashCode() {
return 31 * $this->size +hashCode($this->bits);
}
public function toString() {
$result = '';
for ($i = 0; $i < $this->size; $i++) {
if (($i & 0x07) == 0) {
$result.=' ';
}
$result.= ($this->get($i) ? 'X' : '.');
}
return (string) $result;
}
public function _clone() {
return new BitArray($this->bits, $this->size);
}
}